Guantanamera

Before gaining his powers, the man who would become Mr. Bloom was an anonymous participant of Daryl Gutierrez's underground metahuman experiments in Blossom Row. Said experiments resolved to grant ordinary civilians metahuman powers through the consumption of a device known as a "seed". Mr. Bloom was the only successful subject and after he was imbued with powers, he destroyed the lab and appropriated Daryl's research and his moniker as Mr. Bloom.